LAARS Heating Systems
Page 66
fig. 81 – modbus Connections
Boiler 1
Ctrl
1
Ctrl
2
A B C
MB 2
MB 1
MB 2
MB 1
A B C
Boiler 2
Ctrl
1
Ctrl
2
A B C
MB 2
MB 1
MB 2
MB 1
A B C
Boiler 3
Ctrl
1
Ctrl
2
A B C
MB 2
MB 1
MB 2
MB 1
A B C
Boiler 4
Ctrl
1
Ctrl
2
A B C
MB 2
MB 1
MB 2
MB 1
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
Display
9
8
7
6
5
4
3
2
1
B
A
C
B
A
C
B
A
C
MB1
MB2
R1
Display
MB1 connections -
Do not change
Disconnect
the wires from
MB2 to the
display
fig. 80 – Disconnecting an Unused operator
Interface
Job H - Connect the modbus Wiring
(This is an individual function – do this on each of the controls.)
In an installation with multiple boilers, the controllers
are arranged in a “daisy chain.” The wiring from
the Secondary controller on one boiler runs to the
Primary controller on the next boiler. Use 22 AWG
or thicker shielded twisted pair wire with drain. Two
twisted pairs or three conductors are needed.
note
– The Modbus wiring should be done last. The
controllers must be set up and addressed correctly
before the wiring is complete. If the wiring is attached
before the Modbus addresses for the controllers are
set up, there might be multiple controls with the same
address, and the system will not work.
1. Connect the wiring from the Secondary
controller on Boiler 1 to the Primary controller
on Boiler 2. Connect three wires from the
Modbus 1 terminal (MB1 on J3) on the
Secondary control on Boiler 1 to MB1 (also
MB1 on J3) on the Primary control on Boiler 2.
Wire A on Boiler 1 must be connected to A on
Boiler 2, wire B on Boiler 1 goes to B on Boiler
2, and wire C on Boiler 1 goes to C on Boiler 2.
2. Repeat this wiring from Boiler 2 to Boiler
3, and from Boiler 3 to Boiler 4 if additional
boilers are included. A maximum of 4 boilers or
8 controls can be connected this way.
3. Another part of the “daisy chain” connection
uses the MB2 connectors. Connect three wires
from the Modbus 2 terminal (MB2 on J3) on
the Secondary control on Boiler 1 to MB2 (also
MB2 on J3) on the Primary control on Boiler
2. Be sure that wire A on Boiler 1 goes to A on
Boiler 2, wire B on Boiler 1 goes to B on Boiler
2, and wire C on Boiler 1 goes to C on Boiler 2.
4. Repeat this wiring from Boiler 2 to Boiler
3, and from Boiler 3 to Boiler 4 if additional
boilers are included.
5. Connect the drain wire from each twisted pair
wire to ground on one end of each wire only.
Job I – Set the Parameters Used by the
lead/lag System
(This is a Lead/Lag function – do this once for the whole Lead/
Lag system. Use the controller set up as the Lead/Lag Master –
usually the Primary controller on Boiler 1.)
We have already explained how the Lead/Lag Master
controls the operation of the Lead/Lag system. Your
job at this point is to enter the control values that the
Lead/Lag system will use.
Summary of Contents for NTV1000
Page 2: ......
Page 35: ...NeoTherm Boilers and Water Heaters Page 31 Fig 20 Ladder Diagram...
Page 36: ...LAARS Heating Systems Page 32 Fig 21 Wiring Diagram...
Page 37: ...NeoTherm Boilers and Water Heaters Page 33...
Page 51: ...NeoTherm Boilers and Water Heaters Page 47 Fig 52 Connection Terminals...
Page 130: ...LAARS Heating Systems Page 126 Fig 140 Machine Frame and Rear Panel 13 3 PARTS ILLUSTRATIONS...
Page 131: ...NeoTherm Boilers and Water Heaters Page 127 Fig 141 Front Panel and Covers...
Page 132: ...LAARS Heating Systems Page 128 Fig 142 Burners and Combustion Chambers...
Page 134: ...LAARS Heating Systems Page 130 Fig 145 Electronic Components...
Page 135: ...NeoTherm Boilers and Water Heaters Page 131 Fig 146 Condensate Trap Fig 147 Control Bezel...
Page 136: ...LAARS Heating Systems Page 132 Fig 148 Flow Switch...
Page 137: ...NeoTherm Boilers and Water Heaters Page 133 This page intentionally left blank...